Allow arbitrary code snippet to be added to GradleBuild

[jjathman]

In my custom Spring initializr instance I would like to include this block in every build.gradle file that is produced. As far as I could tell there was no way to produce a from block that took a string parameter as well as a closure parameter. It's possible I was missing this though.

distributions {
    main {
        contents {
            from('src/main/resources/application.yml') {
                into "conf"
                rename "(.*)", '$1.j2'
            }
        }
    }
}

[wilkinsona]

Thanks for your patience.

I'm afraid I don't think I understand the request. The original title of the issue was "Unable to customize distributions fully" but Initializr has no support at all at the moment for configuring a Gradle build's distributions. If you are extending the Groovy and Kotlin DSL writers' capabilities to support the configuration of distributions, can you not implement support for the from block that meets your needs?

[jjathman]

Sorry about the confusion, I was trying to show what I'm attempting to do with my code block in my original post. I want to be able to customize the generated build.gradle file by customizing the distributions block. The problem is due to GradleTask.Builder having an invoke method but that method does not allow for passing a closure to the method to invoke. I'm trying to generate the code from my original post, but it is very difficult to do. The code below was the solution I came up with, but it is definitely a hack.

    private void customizeDistributionContents(GradleBuild build) {
        build.tasks().customize("distributions") { task ->
            task.nested("main") { mainBuilder ->
                mainBuilder.nested("contents") { contentsBuilder ->
                    contentsBuilder.invoke("from(", """ 'src/main/resources/application.yml') {
                        into 'conf'
                        rename '(.*)', '\$1.j2'
                    }
                    """)
                }
            }
        }
    }

An alternative that would be fine with me would to be able to customize the final content of the file and just being able to add this additional block of content. I realize my use case is probably rather unique. The existing GradleBuild.Builder API is really close, but just wasn't quite flexible enough for my needs.

[wilkinsona]

Thanks for the clarification. Your code above is treating distributions as a task when it's actually an extension. It's purely accidental that you can get as close as you have done.

I don't think we want to provide a complete API for writing arbitrary Groovy or Kotlin DSL code so an escape hatch that allows customisation of the end result may be the best option here.

[jjathman]

Thanks for the help. I think you are right that just some kind of callback that allows for final customization before writing the file would work just great for me.

[snicoll]

I've repurposed this issue to allow arbitrary code snippet to be added at the end of a gradle build.